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Arrangement and method for obtaining information using phase difference of modulated illumination

  • US 7,831,358 B2
  • Filed: 11/09/2006
  • Issued: 11/09/2010
  • Est. Priority Date: 05/05/1992
  • Status: Expired due to Fees
First Claim
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1. A vehicle including an arrangement for monitoring objects in or about a vehicle, comprising:

  • an infrared source from which modulated infrared illumination is emitted into an area in or about the vehicle;

    a receiver arranged to receive infrared illumination reflected from an object in a path of the modulated illumination; and

    circuitry coupled to said receiver and said source and arranged to compare a phase of the emitted modulated illumination with a phase of the received illumination at a common frequency to determine a phase difference between the modulated illumination and the reflected illumination,said circuitry being arranged to obtain three-dimensional information about the object from the determined phase difference and monitor movement of the object based on data obtained from the three-dimensional information.

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